Battery problem

[ducatikid]

Hi guys, i'm running a B44 with a Mamba Max 7700kV system. Its been running fine until recently, after i have charged the Intellect 3600 cells the car runs slow then starts to pick up speed during a run. I'm only using a Ripmax Pro-peak charger with a 3.5A charge rate, the charger doesn't have an inbuilt discharge facility so i run the car down until the wheels stop. Can anyone shed any light, is it a dodgy cell?

Thanks in advance

Lee